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In this paper, we evaluated the performance of different quantum chemical methods for calculating ^13C chemical shifts of acetylsalicylic acid and its derivatives.

我们用量子化学的方法预测了乙酰水杨酸及其衍生物分子上碳原子的化学位移，并通过比较计算值和实验值得到不同理论计算方法的误差范围。

The chemical shifts and concentrations of the metabolites in the serum were measured in serum samples with pH varied between 7.0 and 7.8. It was demonstrated that, from pH 7.0 to pH 7.8, the chemical shifts of many low molecular-weight metabolites drifted upfield and the intensities of phenylalanine, tyrosine, histidine, and lactate in the T 2-weighted NMR spectra changed significantly.

实验结果表明 pH的改变不仅能够引起血清中一些小分子代谢物化学位移的改变，还会影响小分子代谢物与蛋白的相互作用，引起这些小分子结合态和游离态含量的变化。

For the PEO-grafted polyaniline series with different contents of EO units, the benzenoid absorption peaks exhibited blue shifts in comparison with polyaniline, the shifts became greater as the content of EO units increased.

与聚苯胺相比，在共聚物的UV-Vis吸收光谱中，原来320nm处的苯环吸收峰出现了蓝移，其蓝移程度随着共聚物EO单元含量的增大而加剧，且Poly较Poly发生更大的蓝移。

In the Okinawa population, nymphs developed faster under LD16:8h and LD14:10h than under LD 12:12h at constant photoperiods. When photopersodic shifts from long days (LD16:8h) to short days (LD 12:12h) at 60 and 120 days restrain nymphal development, while photoperiodic shifts from short days to long days accelerate the nymphal development.

冲绳种群在长日条件下(LD 16：8h)若虫发育显著快于中间日长(LD 14：10h)和短日条件下(LD 12：12h)的若虫发育，孵化后60d或120d将若虫自LD16，8h向LD 12：12h转移，若虫发育受到抑制，而自LD 12：12h向LD 16：8h转移，则促进若虫发育。

The chem. shifts of b-nitrogen atom in 15N-NMR spectra of four 15N-enriched pyridone azo dyes were reported and the correlation between the chem. shifts of 15N atom and the pH values was studied.

报道了四个富氮-15吡啶酮偶氮染料的氮-15核磁共振中β-氮原子的化学位移，研究了氮-15原子和pH值之间的关联。

Results Mobiligy shifts of SSCP in exon 5 of presenilin-1 was detected in 4 cases with Alzheimer,s disease. Two missense mutation were found in the patients by DNA sequence analyse, one mutation was Leu 130 Met and the other was Vall 57 Leu.Another 11 patients showed one single strend shifted rapidly. But none mobility shifts of SSCP were found in patients with vascular dementia and normal controls. Conclusions It is shown that mutations in exon 5 of presenilin-1 also exist in the patients with sporadic Alzhemer?

结果 发现4名SAD患者的PCR产物SSCP分析发生泳动异常，DNA序列分析发现：这4名SAD患者的130号密码子发生了CTG→ATG错义突变(388位点发生C→A突变)，使编码的氨基酸由亮氨酸变为蛋氨酸(Leu 130 Met)；157号密码子发生了GTG→CTG错义突变(469位点发生G→C突变)，使编码的氨基酸由缬氨酸变为亮氨酸(Val 157 Leu)，另有11名患者SSCP表现为一条单链增快，其性质待定。

They found that most of the columbines' nectar spur length evolution happened during shifts in pollinators from bumblebees to hummingbirds, and from hummingbirds to hawkmoths. In between these shifts, evolution of the columbines' nectar spurs came to a halt.

Whittall和Hodges发现，在许多植物中，这种协同进化更具有&一边倒&的倾向，蜜管会随着采蜜者喙的长度而进化，随后这一过程会中止，只有新的采蜜者出现才能让进化过程重新启动。

But, and here I go back to my starting point, all of these discursive shifts and swayings, as well as many of the shifts and turns that have occurred in the strategies for commanding the international market in wine, have at their root not only the search for profit but also the search for monopoly rents.

但在此，我回到我的起点，即这一切论述移转和摇摆，以及支配酒类国际市场之策略的众多变化和曲折，在其根本上不仅是追求利润，还是寻求垄断地租。

For many people, Nostromo is difficult to read, and the greatest difficulty may lie in Conrad\'s deliberate use of confusing time shifts in the novel, and in the course of narrating the author does not immediately tell his reader in a way with temporal clauses or other transitional words or phrases that signal where the forward or backward shifts of time begin and end.

阅读《诺斯托罗莫》的最大困难可能产生于康拉德故意使用的&时间错位&，而且这种&时间错位&的叙述又没有提供可供参照的准确标记。

By analyzing next-spring abnormal features of 500 hPa height and 850 hPa, 200 hPa meridional wind due to Nino3 SST rising, it is found that Nino3 SST rising abnormally in the second half year leads to 500 hPa height field rising in the tropic and Northwest Pacific subtropical region, namely the Northwest Pacific subtropical high is stronger and shifts westwards and northwards compared with the mean, and the trough over East Asia is weaker with its location shifts eastwards; the height field falls from the area around Balkhash to Baikal Lake, i.

通过分析下半年Nino3区(150o~90oW，5oS～5oN)海表温度升高引起的次年春季500 hPa高度、850 hPa及200 hPa经向风的异常特征，发现下半年Nino3区显著升温，可导致次年春季热带和西北太平洋副热带地区的500 hPa高度场升高，即西太平洋副热带高压偏强、偏西、偏北，东亚大槽偏弱、偏东；巴尔喀什湖至贝加尔湖的高度场降低，即该地区经常有低槽维持；亚洲至西太平洋地区盛行纬向环流。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。